diff --git a/functions-common b/functions-common
index ab5a1a4b3c..0e157290bc 100644
--- a/functions-common
+++ b/functions-common
@@ -179,6 +179,12 @@ function die_if_not_set {
     $xtrace
 }
 
+function deprecated {
+    local text=$1
+    DEPRECATED_TEXT+="\n$text"
+    echo "WARNING: $text"
+}
+
 # Prints line number and "message" in error format
 # err $LINENO "message"
 function err {
@@ -1699,6 +1705,16 @@ function run_phase {
     if [[ -d $TOP_DIR/extras.d ]]; then
         for i in $TOP_DIR/extras.d/*.sh; do
             [[ -r $i ]] && source $i $mode $phase
+            # NOTE(sdague): generate a big warning about using
+            # extras.d in an unsupported way which will let us track
+            # unsupported usage in the gate.
+            local exceptions="50-ironic.sh 60-ceph.sh 80-tempest.sh"
+            local extra=$(basename $i)
+            if [[ ! ( $exceptions =~ "$extra" ) ]]; then
+                deprecated "extras.d support is being removed in Mitaka-1"
+                deprecated "jobs for project $extra will break after that point"
+                deprecated "please move project to a supported devstack plugin model"
+            fi
         done
     fi
     # the source phase corresponds to settings loading in plugins